Air-bag puller



July 6 1926.

C. H. DESAUTELS 4 Sheets-Sheet 1 July 6 1926.

c. H. DESAUTELS AIR BAG FULLER Filed Jan. a, ma 4 Sheets-Sheet 4 lN VE1\ /TOR. By W MQOWZZZ A T NEY.

Patented July 6, 1926.

I UNITED STATES 1,591,701 PATENT OFFICE.

CHARLES H. DESA'O'TELS, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO THE FISK RUBBER COMPANY, OF CHICOPEE FALLS, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

AIR-BAG FULLER.

Application filed January nized upon them. It relates particularly to 6 refinements of the machine shown in the patent to Taylor and Desautels, 1,535,382,

granted April 28, 1925, with particular reference to improving its ruggedness, its speed,

and the range of sizes of tires with which it is fitted to deal. Other improvements in operatin features of the prior machine will appear rom the detailed description which follows.

Referring to the drawings Fig. 1 is a side elevation of a machine constructed in accordance with my invention;

Fig. 2 is a diagrammatic viewillustrating the proportions of the crank mechanism 20 which operates the bag extracting arm;

Fig. 3 is a front elevation of the machine;

Fig. 4 is a similar View showing the parts in different operating positions;

Fig. 5 is a detail on line 55 of Fig. 3;

Fig. 6 is a diagrammatic representation of two cam paths and their corelation;

Fig. 7 is a plan view of the machine;

Fig. 8 is a detail, looking from the opposite side of the machine than in Fig. 1;

Fig. 9 is a front View of the parts shown in Fig. 8;

Fig. 10 is a detail section, taken on line 1010 of Fig. 7; and 7 Figs. 11 and 12 are diagrammatic views illustrating the action of the crank mechanism and certain attendant parts during four stages of the operatin cycle.

The general princip e of the present machine is the same as that shown in the above referred to Taylor and Desautels patent, comprising mechanism for holding the tire open, and an arm or spade'which is moved by a linkage through a ath so as to break the bag away from the inside of the casing and thrust it out to one side. The operating linkage for the spade has been left substantially as in the earlier machine, the main changes being in the devices for grasping and opening the tire.

The machine is mounted on a base 15 upon which are formed suitable journals 16 for the shafts to be described later. An electric motor 17 has its shaft provided with a pinion 18 meshing with a gear 19 fixed to one member 20 of a clutch which is suitably 8, 1926. Serial No. 80,132.

mounted on a shaft 21. This clutch is shown particularly in Figs. 7, 8 and 9. The movable member-22 of the clutch is provided with-a groove 23 in which run the rollers of a shipper bar 24, formed in this instance as one member of a bell crank lever 25. The other member of the bell crank. which is pivoted in a bracket 26, is bent as shown in I Fig. 9 so as to'extend through a slot 27 in the base 15. By means of a short link 28 this arm is connected to one arm of a second bell crank 29, the other arm of which, as shown in Fig. 1, is connected with a treadle 30 by means of 'a rod 31. A spring 32, hearing at one end against a collar 33 fastened to the rod and at the other against a fixed part of the machine, holds the clutch normally in disengaged position.

When the clutch is engaged a direct coupling is made between the gear 19 and a 1,535,382. The stripplng arm 41 itself is formed with a spade 42 pivoted to the body of the arm and adapted to enter between the bag and the tire when the spade is in the dotted line position of Fig. 11. An overhanging portion 43 is adapted to bear against the inner periphery of the bag in order to force it out of the tire. The main portion of the stripping arm is formed with a curved section 44, permitting clearance of the tire and the tire gripping mechanism when the arm is in the dotted line position of Fig. 12, and also has a straight portion 45 by which it is connected to the operating mechanism. a 1

At the rear end of this straight portion 45 the arm is pivoted at 46 to a rocking lever or thrust arm 47, preferably forked at its upper end to receive the arm 41 and having rocking bearings at 48 on the base. At the forward end of the straight portion 45 of the arm is pivoted one end of a con necting link 49, the other end of which is pivoted to a crank on shaft 40. Pivoted to the thrustarm at 50 is a connecting rod 51 coupling it to a crank on the other crank shaft 38. As mentioned above, the crank shaft connected to the forward end of the arm operates at three times the speed of crank shaft 38.

With the various linkages proportioned as to dimensions and angles as shown in Fig. 2, the end of the spade will be caused to follow the path shown in Figs. 11 and 12. As is apparent from these figures the end of the spade moves from the full line posi tion of Fig. 11 along a portion of the path which develops into a substantially straight portion 52 leading between the opened tire and the bag. The spade then lifts, travelling along a substantially vertical portion of the path to a high point 53 and then down an outwardly inclined portion of the path to a low point 54. In retracing itsstep the arm follows a path 55 somewhat parallel to thai; traversed in the operating part of the eye e.

As in the prior patent the tire rests upon a movable support 56 provided with a curved shoe 57 which, in the operation of the machine, causes the tire to be buckled inwardly so as to expose the bag. This support is formed as a slide running in suitable guideways 58 on the base of the machine and connected by a link 59 with the forward end of a lever 60 pivoted at 61 to the base and carrying at its rear end a cam roll 62 running in the groove 63 of a cam disk 64 on the end of shaft 38. As is shown in Fig. 7 this lever is offset at its pivot so that its ends will be aligned respectively with the slide and the cam disk.

Instead of the arrangement of hooks on both sides of the tire shown in the prior patent the present machine has been provided with hooks 65 on one side only, as shown particularly in Fig. 10. By having the hooks solely on one side of the tire it has been found that a somewhat greater range of tire sizes may be handled. The hooks (see Figs. 1, 3 and 10) are carried at one end of a shaft 66, at the other end of which is an arm 67 provided with a series of holes 68. A yoke 69, through which fits a pin 70, is adapted to be located by means of this pin in any one of the holes on the arm in order to vary slightly the amount of throw given to the hook. Attached to the yoke is a rod 71- sliding in a holder 72 and held in position by a spring 73. This spring affords a convenient safety device, avoiding breakage of the mechanism in case anything gets caught between the hook and the tire support. The rear end of the holder is pivoted to the top of an arm 74 swinging ona suitable hearing at 75 on the base 15 and carryin a cam roll 76 fitting into a cam groove 7 on the face of a disk 78. This disk is carried on a sleeve 79 which turns freely upon an extension of the crank shaft 40 and which is connected, by gears 80 of equal diameter, to the crank shaft 38. By this arrangement, even though the crank shaft 40 turns at three times the speed of the crank shaft 38, the cam disk 78 will be run at the same speed as the crank shaft 38.

The device for holding and tensioning the tire at its upper side is in general similar to that shown in the earlier patent. Certain operating details have, however, been varied in the interests of reliability of operation. This upper hook 81 is carried by a main slide 82 running in side guides secured to a pedestal 83 rising from the base of the machine Links 84 pivoted to this main slide connect with the slide which carries the curved shoe 57 upon which the tire rests. The upper end of the main slide is formed with a guideway 85 in which runs a secondary slide 86. The hook 81 which, as shown in Fig. 1, is shaped to grasp the inner bead of the tire, is secured to the bottom of this slide. The top of the secondary slide is connected by a cord 87 passing over pulleys 88 to a counterweight 89 (Fig. 7). A small bracket 90, mounted on the main slide at one side, has a sliding pawl 91 (Fig. 5) carried by a bar 92 which is pressed outwardly by means of a spring 93. At the outer end of this bar a small spring pressed contact iece 94 is mounted, this being adapted or contact with a rocking lever 95 (Figs. 3 and 4), the other end of which carries a cam roll 96 bearing against a cam 97 formed on a stationary part of the machine. As the main slide 82 rises this cam roll contacts with a slanting portion of this stationary cam, rocking the lever 95 and forcing the pawl 91 into contact with a ratchet 98 on the side of the small slide 86, as is clearly shown by a comparison of Figs. 3 and 4.

This construction of the upper hook is designed to permit the machine to handle tires of different sizes without intermediate adjustment being necessary. During the first part of the upper movement of the main slide the small slide 86 will be held in its uppermost position by means of the counterweight 89, and the two slides moved upwardly together until the hook 81 contacts with the bead of the casing. The motion of the small slide thereupon stops and the main slide continues alone until it has reached nearly the upper limit of its motion. The cam roll then rides on the stationary cam 97, forcing the pawl into contact with the ratchet 98 and locking the two slides together. The short final movement of these two slides in unison gives a slight tension to the tire beads, whlch is uniform irrespective of the size of the casing which is inserted in the machine.

In operation a tire with a pressure fluid a guide 99 attached to the pedestal 83. At

the time of the insertion of the tire the spade is in substantially the full line posit1on of Fig. 11. While the spade 1S making a short idle travel and is approaching the horizontal part of its path, the curved tire support 57 rises, as is shown in Fig. 11 y a comparison of the full and dotted llne positions. Slightly thereafter, as is 1nd1- cated by the campaths in Fig. 6, the lowerhooks 65 are operated to pull back the rear side of the casing. By the time the spade has reached the dotted line position of Fig. 11 the rear part of the casing has been pulled completely back and a clear access is afforded the spade to penetrate between the bag and the inner surface of the tire casing. With the rise of the tire support 57 the upper hook 81 has also risen, the tire being thus firmly grasped between the upper and the lower hooks. The spade 42 now rises along the vertical part of its path, folding 'the bag inwardly and stripping it from the lower part of the casing. After the spade passes the upper point of its travel it moves outwardly and downwardly, carrying the bag outside the casing and pulling it so that it snaps out of the casing as indicated in Fig. 3 of the prior patent.

At this pointtlie spade arm is in a position shown in dotted lines-in Fig. 12. As the spade arm returns through the full line position of Fig. 12 to the full line position of Fig. 11, the lower hooks release and the slide operating the tire support and theup per hook drops, thus freeing the tire for re-, moving. When the tire is free from the hooks it may be removed from the machine and a fresh tire inserted, the machine being meanwhile temporarily stopped if desired by the operator releasing the treadle.

Having thus described my invention, I claim-:-

1. In a machine for pulling fluid pressure bags out of vulcanized tire'casings, mechanism for pulling back one bead of the tire to afford access to the bag leaving the other H bead substantially undistorted, and bag gripping means having a path of motion.

so as to first fold the bag inwardly and then force it out of the tire over the undistorted bead.

2. In a machine for pulling fluid pressure bags out of tire casings, means for holdlng the tire, means for folding back a head of the tire to afford access to the bag, and a spade adapted to enter between the bag and the tire and separate them from each other, said spade having a slight free movement so as to adjust itself to inequalities in the bag and easing.

. 3. In a machine for pulling fluid pressure bags out of tire casings, a vertically movable tire support, means for grasping a bead of the tire so that the vertical movement of the support will turn the tire partially inside out, a slide operable with the support, a.

hook for the tire bead slidingly mounted in the slide, a counterweight for keeping the hook normally at the top of its sliding movement, a ratchet attached to the sliding hook, a pawl slidingly mounted on the slide, a cam mounted upon a stationary part of the machine, and a rocking arm contacting with said cam at one end and with the pawl at the other to couple the slide and the sliding hook together at a predetermined point of their travel.

4. Ina machine for pulling fluid pres sure bags out of tire casings, a vertically movable tire support, a rocking shaft located adjacent said support, hooks secured to said shaft, mechanism for raising and lowering the support, and mechanism for rocking the shaft independently of the mechanism for raising and lowering the the support.

5. In a machine for pulling fluid pressure bags out of tire casings, means for holding a tire with a bead thereof folded back to afford access to the bag, a spade holder, a spade carried by the holder and having a slight free movement therein enabling it to adjust itself to inequalities in the bag and casing, and means for moving the spade holder through a definite path of motion relative to the tire whereby first to insert the spade between the bag and tire and then to separate the bag from the tire.

CHARLES H. DESAUTELS. 

